Yes, I agree with Buster, a vet check is in order, while sometimes food allergies can cause paw itching, I would worried it might be something more serious since you say it looks swollen. There’s something called a Foxtail, that can get lodged in between their toes, and it’s very painful and should be caught as soon as possible because they can work their way up further the foot.
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Foxtails are another not-so-fabulous right of spring. These grass awns, which sprout in abundance this time of year, have microscopic barbules along their surface. Once they catch on animals’ fur, they can become lodged in their skin (most often in the webbing between the toes), ear canal, or nose. Foxtails cause extreme discomfort and often lead to bleeding, infection, and, in the case of ear canal migration, ruptured ear drums. If swallowed, foxtails can lodge in the throat, causing swelling and infection. If accidentally inhaled, they can cause serious damage and infection in the airways or lungs.
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For more information on Foxtails and how to protect your pet see this article.
Protecting Your Dog Against Foxtails | The Bark